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All Journal CHEMPUBLISH JOURNAL Akta Kimia Indonesia Fullerene Journal of Chemistry JURPIKAT (Jurnal Pengabdian Kepada Masyarakat) Jurnal Teknologi Lingkungan Lahan Basah
Mandasari, Weni
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Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Energy Engineering Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Public Health Social Sciences

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Adsorpsi Logam Cd Menggunakan α-Selulosa dari Kulit Buah Nanas Mandasari, Weni; Sitorus, Berlian; Rudiyansyah, Rudiyansyah
Jurnal Teknologi Lingkungan Lahan Basah Vol 11, No 2 (2023): Juli 2023
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v11i2.66762

Abstract

Pineapple fruit is widely consumed that impact on the waste produced. One of which is pineapple peel has a high cellulose content of around 69.5-71%. In this research, the synthesis of α-cellulose from pineapple peel was tings in order produce an adsorbent for Cd2+ metal ions. The prepared pineapple peel powder was delignified using 2% NaOH to remove lignin, were delignified again using 18% NaOH. The α-cellulose formed was bleached using 3.5% NaOCl. α-cellulose was hydrolyzed using H2SO4 with various concentrations of 2, 3 and 4%. The goal is to determine the optimum absorption of the adsorbent. Based on this research, it was found that the maximum adsorption capacity was obtained at 4% H2SO4 variation  which is 108 mg/g and an efficiency of 54%. The adsorption isotherm model on cellulose meets the assumptions of chemical, and physical adsorption as shown by the R2 value of 0.999. Chemical adsorption (Langmuir isotherm) is indicated by the reaction of the OH group with the metal ion Cd2+. Physical adsorption (Freundlich isotherm) that occurs at heterogeneous adsorption sites supported by changes in surface area (BET) values.
PEMBUATAN KARBON AKTIF AMPAS KELAPA DENGAN AKTIVATOR ASAM FOSFAT (H3PO4) UNTUK MENGADSORPSI ION LOGAM BESI (Fe) Prawiranti, Yulizar; Mandasari, Weni; Shofiyah, Sofi S; Febrianty, Irma R; Utami, Naniek T
Akta Kimia Indonesia Vol 9, No 2 (2024)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v9i2.22084

Abstract

Peat water contains high iron levels and is reddish-brown in color. Consuming iron in doses above the threshold can endanger health and even lead to sudden death. Additionally, iron pollution can disrupt aquatic ecosystems. Coconut pulp has the potential to adsorb heavy metal iron due to its cellulose, mannan, and galactomannan content. The stages of producing adsorbent from coconut pulp include preparation, carbonization, activation of activated carbon, testing of activated carbon consisting of moisture content, volatile matter content, ash content, and pure carbon content tests, FTIR testing, and determining the % adsorption efficiency of iron (Fe) metal ions and adsorption capacity of iron (Fe) metal ions using Atomic Absorption Spectrophotometry (AAS). Carbonization is carried out at a temperature of 400°C for 2 hours, and activation is performed with 3 N phosphoric acid activator for 24 hours. The FTIR results of coconut pulp activated carbon (CPAC) show a slight increase in the C=O stretching absorption peak and a decrease in almost all absorption peaks such as O-H stretching, C=C aromatic ring, C-H bending, C=O stretching, and =C-H aromatic. A new absorption peak appears in CPAC at the absorption region of 908.47 cm⁻¹, indicating the formation of =C-H aromatic bonds. The efficiency percentage shows that CPAC can adsorb Fe metal ions by 99.16% with an adsorption capacity of 0.22 mg/g, while coconut pulp carbon (CPC) can adsorb Fe metal ions by 34.66% with an adsorption capacity of 0.08 mg/g.  
Pemanfaatan Minyak Bekas Goreng dan Limbah Kopi sebagai Lilin Aromaterapi untuk Meningkatkan Minat Belajar Kimia Siswa di SMAN 2 Pontianak Prawiranti, Yulizar; Weni Mandasari; Delta Fenisa; Muftiah Yasi Dwi Wahyuni; Elpe Bibas; Fitriyan Kurnia; Pratika Linanda
JURPIKAT (Jurnal Pengabdian Kepada Masyarakat) Vol. 6 No. 3 (2025)
Publisher : Politeknik Piksi Ganesha Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37339/jurpikat.v6i3.2447

Abstract

This service program aims to increase students' interest in chemistry lessons through contextual activities, namely making aromatherapy candles from used cooking oil and coffee. This activity responds to the challenge of students' low understanding of chemistry concepts and the lack of education on sustainable household waste management. The implementation was conducted in the form of interactive training to 12th grade science students at SMAN 2 Pontianak, combining demonstration with hands-on practice. Pre-Test results showed an average initial understanding of 89.63%, then significantly improved after the training, with 93% of participants reaching the excellent category. Satisfaction surveys showed positive responses to the quality of learning and guidance provided. This activity was able to bridge chemical theory with real applications, as well as introduce circular economy principles in a simple way. The impact of the activity includes increased understanding, appreciation of chemistry, and environmental awareness. This activity has the potential to be implemented in other schools as a practice-focused learning method.
Inovasi Produk Kimia Ramah Lingkungan: Sabun Herbal dari Limbah Kulit Nanas sebagai Media Edukasi Siswa MAN 2 Pontianak Weni Mandasari; Yulizar Prawiranti; Sofi Siti Shofiyah; Muftiah Yasi Dwi Wahyuni; Fitriyan Kurnia; Atika Wulandari Putri; Dodi; Yudith Evametha Vitranilla; Weny Ramadhania
JURPIKAT (Jurnal Pengabdian Kepada Masyarakat) Vol. 6 No. 3 (2025)
Publisher : Politeknik Piksi Ganesha Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37339/jurpikat.v6i3.2450

Abstract

Many high school students perceive chemistry as a difficult subject and find it less relevant to daily life. To increase students' interest in chemistry studies, a Student Creativity Program (PKM) was conducted through the creation of herbal soap made from pineapple peel waste. Pineapple peel (Ananas comosus) was chosen because it contains bioactive compounds such as bromelain, flavonoids, tannins, and vitamin C, which have antibacterial and antioxidant properties. Through a project-based practical method, students from MAN 2 Pontianak were directly involved in the herbal soap-making process. The results of the activity showed an improvement in students' understanding of chemistry concepts and an increased interest in chemistry studies. Additionally, this activity supports environmental sustainability by utilizing organic waste. The implementation of practical learning methods has proven effective in enhancing critical thinking skills and fostering students' creativity in producing environmentally friendly products.
Production of Liquid Organic Fertilizer from Pineapple Peel Waste Using EM4 as a Bioactivator Mandasari, Weni; Prawiranti, Yulizar; Shofiyah, Sofi Siti; Febriaty, Irma Ramadhani; Utami, Naniek Tri
Jurnal Kimia Fullerene Vol 10 No 2 (2025): Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v10i2.741

Abstract

Pineapple peel waste is an abundant agricultural residue that remains underutilized. This study aims to produce liquid organic fertilizer (LOF) from pineapple peels using EM4 bioactivator, cow manure, rice-washing water, and palm sugar through a 30-day fermentation process. Fermentation performance was monitored via daily temperature and pH, along with nutrient content analysis including nitrogen (N), phosphorus (P), potassium (K), and organic carbon (C-organic). The results showed temperature ranged from 27.9–32.3°C and pH between 3.0–4.0, within the optimal range for microbial activity. However, nutrient concentrations of N (0.153%), P (0.116%), K (0.105%), and C-organic (1.58%) did not meet the Indonesian National Standard (SNI 261/2019). This indicates that pineapple peel alone requires nutrient-rich additives to produce standard-compliant LOF. This study highlights the potential of pineapple peel waste as an eco-friendly LOF source, emphasizing the need for further formula optimization.
Sintesis dan Karakterisasi Karbon Aktif dari Ampas Kelapa melalui Aktivasi Fisika-Kimia serta Potensinya untuk Pemurnian Biogas Prawiranti, Yulizar; Mandasari, Weni
Chempublish Journal Vol. 10 No. 1 (2026): Chempublish Journal (January - June)
Publisher : Department of Chemistry, Faculty of Science and Technology Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/chp.v10i1.48610

Abstract

The increasing global demand for renewable energy and the urgent need to reduce greenhouse gas emissions highlight the importance of developing sustainable technologies for biogas upgrading. Coconut pulp, a plentiful agro-industrial residue rich in cellulose, hemicellulose, and lignin, offers a promising precursor for activated carbon production while addressing agricultural waste challenges. This study aimed to synthesize and characterize coconut pulp–based activated carbon through a combined physicochemical activation process and to evaluate its theoretical potential for CO₂ and H₂S adsorption in biogas purification. The preparation involved carbonization at 400 °C, sequential chemical activation using 3 N H₃PO₄ and 3 N KOH, followed by physical activation at 600 °C under semi-closed conditions. Proximate analysis revealed a moisture content of 4.665%, ash content of 0.637%, and a final yield of 12.38%, all within the Indonesian National Standard (SNI 06-3730-1995) limits except for volatile matter, which remained high due to the soft lignocellulosic nature of coconut pulp. BET surface analysis demonstrated a specific surface area of 345.57 m² g⁻¹, total pore volume of 0.1595 cc g⁻¹, and a dominant micropore area of 282.80 m² g⁻¹, indicating strong potential for small-molecule adsorption. The iodine number of 161.973 mg g⁻¹ confirmed micropore prevalence. FTIR spectra showed a marked decrease in –OH and C=O groups and the emergence of a new band near 900 cm⁻¹ (=C–H aromatic), evidencing the formation of stable aromatic domains. SEM–EDX images revealed a hierarchical pore network (macro–meso–micro) with uniform distribution and high carbon purity (96.65%) and minimal mineral residues. These structural and chemical features suggest enhanced interaction with acidic (H₂S) and non-polar (CO₂) gases through physisorption mechanisms. Compared with single-stage activation methods, the dual chemical–physical strategy provided superior surface area, pore connectivity, and carbon purity, representing a novel approach for biomass-derived adsorbents. Overall, coconut pulp–derived activated carbon synthesized via integrated physicochemical activation exhibits favorable physicochemical properties for efficient CO₂ and H₂S removal, supporting its application as a sustainable and low-cost adsorbent for biogas upgrading. Future work should include dynamic adsorption studies under real biogas conditions to validate the theoretical predictions and to optimize activation parameters for large-scale deployment.
Analisis Kualitas Air Parit Sungai Jawi: Parameter Fisik, Kimia dan Logam Berat di Kota Pontianak Utami, Naniek Tri; Irma Ramadhani Febriaty; Sofi Siti Shofiyah; Weni Mandasari; Yulizar Prawiranti
Jurnal Teknologi Lingkungan Lahan Basah Vol. 14 No. 2 (2026): July 2026
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jtllb.v14i2.101687

Abstract

Degradasi kualitas air parit Sungai Jawi, Kota Pontianak, disebabkan limbah dari zona rumah sakit, bengkel dan permukiman. Penelitian ini bertujuan menganalisis parameter fisik (suhu, Total Suspended Solids/TSS, Total Dissolved Solids/TDS, turbidity), kimia (pH, Biochemical Oxygen Demand/BOD, Chemical Oxygen Demand/COD, Dissolved Oxygen/DO) dan logam berat (Fe, Mn, Zn, Cu, Cd, Pb). Sampel air diambil saat pasang menggunakan water sampler dengan koordinat GPS dan dianalisis logam berat menggunakan Atomic Absorption Spectrophotometry. Hasil menunjukkan suhu tertinggi 28,4 °C di zona bengkel, pH terendah 5,91 di zona rumah sakit. TSS dan turbidity berada pada kisaran 13-14 mg/L dan 14-14,5 NTU, TDS di bawah standar mutu yaitu 0,89-0,97 ppm. BOD dan COD melebihi baku mutu dengan nilai BOD 30-31 mg/L dan COD tertinggi 40,32 mg/L di permukiman, mengindikasikan pencemaran organik berat. DO rendah di permukiman yaitu 3,61 mg/L, menunjukkan tekanan oksigen terlarut yang terbatas. Logam berat Fe dan Pb di zona rumah sakit masing-masing 0,3986 mg/L dan 0,0463 mg/L, melebihi batas maksimal baku mutu (Fe 0,3 mg/L, Pb 0,03 mg/L), mengindikasikan risiko pencemaran yang serius. Mn, Zn, Cu, dan Cd masih dalam batas aman.
Co-Authors Berlian Sitorus Delta Fenisa Dodi ELPE BIBAS, ELPE Febrianty, Irma R Fitriyan Kurnia Irma Ramadhani Febriaty Irma Ramadhani Febriaty Linanda, Pratika Muftiah Yasi Dwi Wahyuni Naniek Tri Utami Prawiranti, Yulizar Putri, Atika Wulandari Ramadhania, Weny Rudiyansyah Rudiyansyah Shofiyah, Sofi S Shofiyah, Sofi Siti Sofi Siti Shofiyah Utami, Naniek T Yudith Evametha Vitranilla